As a supporter of the cause, his reports were tendentious in the extreme.
having or marked by a strong tendency especially a controversial one; "a tendentious account of recent elections"; "distinguishing between verifiable fact and tendentious assertion
{s} showing a definite purpose, having a clear tendency, showing a definite tendency; biased; that tries to influence opinion
Having a tendency; Written or spoken with a partisan, biased or prejudiced purpose
Something that is tendentious expresses a particular opinion or point of view very strongly, especially one that many people disagree with. His analysis was rooted in a somewhat tendentious reading of French history. = controversial. a tendentious speech, remark, book etc expresses a strong opinion that is intended to influence people (tendency)